The term "brokerages" refers to firms that provide intermediary services between buyers and sellers, in areas such as real estate, securities, and insurance. To find antonyms for "brokerages," we can focus on the opposite of these intermediary roles. Some possible antonyms include "direct sales," "in-house transactions," or "personal negotiations." These terms suggest a more direct and personalized approach to buying and selling, without the need for a third party broker or intermediary. However, it's worth noting that the antonym for "brokerages" may vary depending on the context and field of business.